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migrations/005_platform_identities.sql

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+-- Migration 005: Platform Identities
+-- Phase 5: Cross-platform account linking
+-- Created: 2026-02-01
+
+-- Platform identities table
+-- Links platform-specific user IDs to a unified User record
+CREATE TABLE IF NOT EXISTS platform_identities (
+    id SERIAL PRIMARY KEY,
+    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    platform VARCHAR(50) NOT NULL,
+    platform_user_id VARCHAR(255) NOT NULL,
+    platform_username VARCHAR(255),
+    platform_display_name VARCHAR(255),
+
+    -- Metadata
+    is_primary BOOLEAN DEFAULT FALSE,
+    linked_at TIMESTAMP WITH TIME ZONE DEFAULT (NOW() AT TIME ZONE 'UTC'),
+    last_used_at TIMESTAMP WITH TIME ZONE DEFAULT (NOW() AT TIME ZONE 'UTC'),
+    is_active BOOLEAN DEFAULT TRUE,
+
+    -- Verification
+    is_verified BOOLEAN DEFAULT FALSE,
+    verified_at TIMESTAMP WITH TIME ZONE,
+
+    -- Constraints
+    CONSTRAINT uq_platform_user UNIQUE (platform, platform_user_id)
+);
+
+-- Indexes
+CREATE INDEX IF NOT EXISTS idx_platform_identities_user_id ON platform_identities(user_id);
+CREATE INDEX IF NOT EXISTS idx_platform_identities_platform_user_id ON platform_identities(platform_user_id);
+
+-- Linking tokens table
+-- Temporary tokens for linking accounts across platforms
+CREATE TABLE IF NOT EXISTS linking_tokens (
+    id SERIAL PRIMARY KEY,
+
+    -- Source platform
+    source_platform VARCHAR(50) NOT NULL,
+    source_platform_user_id VARCHAR(255) NOT NULL,
+
+    -- Token details
+    token VARCHAR(100) NOT NULL UNIQUE,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT (NOW() AT TIME ZONE 'UTC'),
+    expires_at TIMESTAMP WITH TIME ZONE NOT NULL,
+
+    -- Usage tracking
+    is_used BOOLEAN DEFAULT FALSE,
+    used_at TIMESTAMP WITH TIME ZONE,
+    used_by_platform VARCHAR(50),
+    used_by_platform_user_id VARCHAR(255),
+
+    -- Result
+    linked_user_id INTEGER REFERENCES users(id) ON DELETE CASCADE
+);
+
+-- Indexes
+CREATE INDEX IF NOT EXISTS idx_linking_tokens_token ON linking_tokens(token);
+CREATE INDEX IF NOT EXISTS idx_linking_tokens_linked_user_id ON linking_tokens(linked_user_id);
+CREATE INDEX IF NOT EXISTS idx_linking_tokens_expires_at ON linking_tokens(expires_at);
+
+-- Comments
+COMMENT ON TABLE platform_identities IS 'Links platform-specific user identifiers to unified User records for cross-platform account linking';
+COMMENT ON TABLE linking_tokens IS 'Temporary tokens for verifying and linking accounts across platforms';
+
+COMMENT ON COLUMN platform_identities.platform IS 'Platform type: discord, web, or cli';
+COMMENT ON COLUMN platform_identities.platform_user_id IS 'Platform-specific user identifier (e.g., Discord ID, email)';
+COMMENT ON COLUMN platform_identities.is_primary IS 'Whether this is the primary identity for the user';
+COMMENT ON COLUMN platform_identities.is_verified IS 'Whether this identity has been verified (for Web/CLI)';
+
+COMMENT ON COLUMN linking_tokens.token IS 'Unique token for linking accounts (8-12 characters, alphanumeric)';
+COMMENT ON COLUMN linking_tokens.expires_at IS 'Token expiration time (typically 15 minutes from creation)';
+COMMENT ON COLUMN linking_tokens.is_used IS 'Whether the token has been used';